Pests and diseases that attack Crystal Guava are the main obstacles in increasing agricultural productivity, as well as disrupting plant physiology and growth. The purpose of this study was to identify pests and diseases of crystal guava (Psidium guajava L). The study was conducted for 3 months, (June-August) 2022 in three crystal guava gardens in Gemawang Village, Dukuh, Ngargoyoso District, Karangayar. Data were obtained from observations of guava plant samples crystals and fruit attacked by pests and diseases, as well as interviews with owners and managers to obtain information about cultivation from planting to harvest. The results of the research found several pests of Crystal Guava (Psidium guajava L.), including: Frogs (Cynopterus spp.), Fruit flies (Bactrocera dorsalis), caterpillars (Setora nitens), ladybugs (Helopeltis sp.), sac caterpillars (Lepidopthera: Psychide), shoot caterpillars (Lepidoptera: Pyralidae), and mealybugs (Paracoccus marginatus). morphology due to nutrient deficiency (potassium/magnesium); black spot and fruit rot by the fungus Collectrichum gleosporioides Penz, fruit canker (scab) Pestalotiopsis psidii (pat) Mordue, red rust by the algae Chephaleurus virescens, wilt disease by the algae Fusarium sp, and the fungus Cercospora psidii. Treatment was carried out once a week, by applying NPK and gandasil fertilizers and spraying with regent 50 insecticides, Yasithrin and Fostin. as well as wrapping young fruit. Pests and diseases found in Crystal Guava plantations in this study can reduce production, therefore the results of this study can be used as information material for novice farmers who want to develop Crystal Guava picking tours both on plantations and in their yards.

Spermatophyta is a seed plant with a very high diversity and is easily found in the surrounding environment. The purpose of this study was to determine the composition of Spermatophyta in the biological greenhouse of the Univet Bantara Sukoharjo. Research This research is exploratory description research with the cruising method (survey). The research was conducted in the biology greenhouse of the Univet Bantara Sukoharjo campus which has an area of about 350 m2. The research procedure consisted of several stages, namely the preparation of tools and materials, observation and documentation of Spermatophyta in the greenhouse, recording of plant characteristics, identification and determination of plants, and data analysis. determination result. The plants data collected were analyzed descriptively and qualitatively. The results showed that the composition of Spermatophyta in the biological greenhouse was 58 species and all of them were angiosperms group which included dicotyledonous and monocotyledonous plants. The number of families found was 40 families. These results indicate that the biological greenhouse is not dominated by a few families but many families that live in the area. Families with more than one species are the Araceae family (talas taro tribe) with 6 species, the Euphorbiaceae family with 4 species, Papilionaceae and Asparagaceae each with 3 species, Mimosaceae, Amaranthaceae, Myrtaceae, Rutaceae, Oxalidaceae, and Orchidaceae were found 2 species. The diversity in the composition of spermatophytes in terms of their families is quite diverse, but the number of species from each family is not large enough so that further development is needed to enrich the diversity of Spermatophyta compositions in the biological greenhouse.